Product Information Bulletin ISSUED: February 3, 2020 357 - 2019 … · (psi) (10) Flexural Strength kPa 170 Minimum ASTM C203 (psi) (25) Water Vapour Permeance2 ng/(Pa•s•m Maximum

DuroFoam® insulation board is a moulded expanded polystyrene (EPS) insulation that meets or exceeds CAN/ULC-S701.1, Standard for Thermal Insulation, Polystyrene, Boards. The addition of a laminated film to the top and bottom surfaces of DuroFoam insulation board provides a more durable product that is less susceptible to handling damage.

Table 1 – DuroFoam Insulation Material Properties

Material Properties1 Units Values Thermal Resistance Minimum per 25 mm (1 inch) ASTM C518

m2•oC/W 0.65 (ft2•h•oF/BTU) (3.75)

Compressive Resistance Minimum @ 10% Strain ASTM D1621

kPa 70 (psi) (10)

Flexural Strength Minimum ASTM C203

kPa 170 (psi) (25)

Water Vapour Permeance2 Maximum ASTM E96

ng/(Pa•s•m2) 30 (Perms) (0.5)

Water Absorption3 Maximum ASTM D2842

% By volume 6.0

Dimensional Stability Maximum ASTM D2126

% Linear Change 1.5

Limiting Oxygen Index Minimum ASTM D2863

% 24

Flame Spread Rating CAN/ULC S102.2 NA 290 Smoke Developed Classification CAN/ULC S102.2 NA Over 500

The reflective facer on DuroFoam insulation contains a thin layer of foil embedded within the film. The reflective facer does not increase DuroFoam insulation thermal resistance (RSI/R-value) – for additional information see Plasti-Fab PIB 253, Facts About Thermal Resistance of Reflective Insulation. The printed green face of DuroFoam insulation should be left exposed outwards to make use of markings provided for easy cutting of insulation and spacing of fasteners into interior framing as required. 1. DuroFoam insulation material properties are third party certified to CAN/ULC-S701.1 under an Intertek third party certification program (see Intertek Code Compliance Research Report CCRR-1072 for additional information). 2. WVP values quoted are maximum values for 25-mm (1-inch) thick DuroFoam insulation with laminated film facers on both sides. 3. The water absorption laboratory test method involves complete submersion under a head of water for 96 hours. The water absorption values above are applicable to specific end-use design requirements only to the extent that the end-use conditions are similar to test method requirements.

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357

Product Information BulletinDuroFoam® Insulation Insulating Sheathing per 2019 ABC Page 1 of 5

July 19, 2017

February 3, 2020

1-88-THINK EPS®Quality, Service and Expertise

This bulletin addresses use of DuroFoam insulation board as exterior insulating sheathing board applied to above grade walls in compliance with the National Building Code - 2019 Alberta Edition (2019 ABC). 1. Air Barrier System Requirements Article 9.25.3.1. requires wall assemblies separating conditioned space from unconditioned space to be constructed so as to include an air barrier system that will provide a continuous barrier to air leakage. DuroFoam insulation may be used as one component in an air barrier system; however, to meet air barrier system requirements in Articles 9.25.3.2. and 9.25.3.3., requirements for sealing of all air barrier penetrations, such as those created by the installation of doors, windows, electrical wiring, electrical boxes, piping or ductwork, must be addressed. 2. Vapour Barrier System Requirements Section 9.25.4. requires a vapour barrier to be installed on the warm side of wall assemblies to provide a barrier to diffusion of water vapour from the interior into wall spaces. Although DuroFoam insulation has a vapour permeance less than 30 ng/(Pa•s•m2), it is attached to the exterior (cold side) of above grade walls. See requirements below related to Properties and Position of DuroFoam Insulating Sheathing in the building envelope applicable to low air and vapour permeance thermal insulation. 3. Properties and Position of DuroFoam Insulating Sheathing DuroFoam insulating sheathing has an air leakage characteristic less than 0.1 L/(s•m2) at 75 Pa and a water vapour permeance less than 30 ng/(Pa•s•m2). Article 9.25.5.1. requires that the location of low permeance thermal insulation as per Article 9.25.5.2. must be considered in order to address the possibility of moisture accumulation within the interior wall cavity. Sentence 9.25.5.2.(1) requires that the ratio between the total thermal resistance of all materials outboard of the interior surface of DuroFoam insulating sheathing and the total thermal resistance of all materials inboard of that surface must be not less than that required by Table 9.25.5.2., Ratio of Outboard to Inboard Thermal Resistance. Wall assemblies with a ratio of outboard to inboard thermal resistance greater than Table 9.25.5.2 ensure that the inner surface of DuroFoam insulating sheathing is likely to be warm enough for most of the heating season such that no significant accumulation of moisture will occur when the vapour barrier function is provided by a separate building element installed on the warm side of the assembly. For additional information on assumptions used in developing Table 9.25.5.2., refer to 2019 ABC, Appendix note A-9.25.5.2. Table 2 - Ratio of Outboard to Inboard Thermal Resistance per ABC 2019 Table 9.25.5.2.

Heating Degree-Days Ratio Heating Degree-Days Ratio up to 4999 0.20 9000 to 9999 0.55

5000 to 5999 0.30 10000 to 10999 0.60 6000 to 6999 0.35 11000 to 11999 0.65 7000 to 7999 0.40 12000 or higher 0.75 8000 to 8999 0.50

4. Insulating Sheathing in lieu of Sheathing Membrane Subclause 9.27.3.4.(2)(b)(i) states that a separate sheathing membrane is not required over insulating sheathing where the joints between boards are sealed. Therefore, when the joints between DuroFoam insulation boards are sealed, a separate sheathing membrane is not required. Refer to Product Information Bulletin No. 205 for additional information on installation requirements. 5. Effective Thermal Resistance (RSIeff/Reff) of Wall Assemblies with DuroFoam Insulation Section 9.36 provides energy efficiency requirements for buildings 3 storeys or less in building height, having a building area not exceeding 600 m2 and used for major occupancies classified as residential occupancies.

DuroFoam insulation Used as Insulating Sheathing Material - 2019 ABC

Product Information Bulletin 357

Page 2 of 5

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DuroFoam insulation Used as Insulating Sheathing Material - 2019 ABC

Product Information Bulletin 357

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Table 5 provides an example of RSIeff/Reff calculations for a 2 x 4 wood stud wall assembly to meet requirements per Table 4 for a building located in Climate Zones 6 to 7A using DuroFoam continuous insulation. Table 6 provides the ratio of outboard to inboard thermal resistance for this wall assembly demonstrating compliance with minimum requirements in Table 2. Table 5 - RSIeff/Reff Calculation for a Building Located in Climate Zone 4 to 7A Wall Assembly Construction (Building with or without HRV)

Framed Portion Continuous Layers RSIF RSIC

Outside Air Film ---- ---- 0.03 Vinyl Cladding ---- ---- 0.11 2” (50.8 mm) DuroFoam Continuous Insulation ---- ---- 1.32 Stud Cavity Insulation ---- 2.29 ---- 2 x 4 Wood Stud @ 16" (406 mm) o/c 0.76 ---- ---- 6 mil polyethylene vapour barrier ---- ---- ---- 1/2" (12.7 mm) Gypsum Wall Board ---- ---- 0.08 Inside Air Film ---- ---- 0.12

RSI Sub-Totals 0.76 2.29 1.66 % Area of Each Component 23% 77% 100%

RSIeff (Reff) RSI-3.22 (R-18.3) Table 6 - Ratio of Outboard to Inboard Thermal Resistance Calculation

Outboard Components RSI Inboard Components RSI Outside air film 0.03 Stud cavity insulation 2.29 Vinyl cladding 0.11 Gypsum board 0.08

2” (50.8 mm) DuroFoam Insulation 1.32 Inside air film 0.12 Total Outboard RSI 1.46 Total Inboard RSI 2.49

Ratio of Outboard to Inboard Thermal Resistance 1.46/2.49 0.59 Table 7 provides an example of RSIeff/Reff calculations for a 2 x 6 wood stud wall assembly using DuroFoam continuous insulation to meet requirements per Table 4 for a building location in Climate Zones 4 to 8 with HDD less than 8,000 (with or without HRV). Table 7 - RSIeff/Reff Calculation for Building in Climate Zones 4 to 8 Wall Assembly Construction (Building with or without HRV)

Framed Portion Continuous Layers RSIF RSIC

Outside Air Film ---- ---- 0.03 Vinyl Cladding ---- ---- 0.11 2” (50.8 mm) DuroFoam Insulation ---- ---- 1.32 Stud Cavity Insulation ---- 3.34 ---- 2 x 6 Wood Stud @ 16" (406 mm) o.c. 1.17 ---- ---- 6 mil polyethylene vapour barrier ---- ---- ---- 1/2" (12.7 mm) Gypsum Wall Board ---- ---- 0.08 Inside Air Film ---- ---- 0.12

RSI Sub-Totals 1.17 3.34 1.66 % Area of Each Component 23% 77% 100%

RSIeff (Reff) RSI-4.00 (R-22.7)

DuroFoam insulation Used as Insulating Sheathing Material - 2019 ABC

Product Information Bulletin 357

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Table 8 provides the ratio of outboard to inboard thermal resistance for this wall assembly demonstrating compliance with requirements in Table 2. Table 8 - Ratio of Outboard to Inboard Thermal Resistance Calculation

Ratio of Outboard to Inboard Thermal Resistance Calculation Inboard Components RSI Outboard Components RSI

Outside air film 0.03 Stud cavity insulation 3.34 Vinyl cladding 0.11 Gypsum board 0.08

2” (50.8 mm) DuroFoam Insulation 1.32 Inside air film 0.12 Total Outboard RSI 1.46 Total Inboard RSI 3.54 Ratio of Outboard to Inboard RSI 1.46/3.54 0.41

DuroFoam insulation Used as Insulating Sheathing Material - 2019 ABC

Product Information Bulletin 357

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